KR20130028687A - Lithium ion secondary battery and preparation process of same - Google Patents

Abstract

PURPOSE: A lithium ion secondary battery comprises an active material layer which is composed of a concave-convex structure with a high aspect ratio, thereby preventing the fracture of a separator, having a high capacity, and having an excellent charging and discharging rate. CONSTITUTION: A lithium ion secondary battery(1) comprises a first electrode(A) which has an active material layer(12) formed of a first current collector(10) and a first active material part(12a); a second electrode(C) which has a second active material layer(16) formed of a second current collector(18) and a concave second active material part(16a); and a separator(20) located in between the first and second electrodes. The first and second electrodes are laminated to make the first material part face second material part.

Description

Lithium ion secondary battery and its manufacturing method {LITHIUM ION SECONDARY BATTERY AND PREPARATION PROCESS OF SAME}

The present invention relates to a lithium ion secondary battery and a manufacturing method thereof.

Conventionally, since lithium ion secondary batteries are lightweight, large capacity, and can be charged and discharged at high speed, they are now widely used in fields such as mobile devices such as notebook PCs and mobile phones, automobiles, and the like. In order to improve discharge characteristics, various studies have been made.

As such a lithium ion secondary battery, for example, as disclosed in FIG. 3 of patent document 1 (Unexamined-Japanese-Patent No. 2008-288214), the positive electrode which consists of a positive electrode active material layer and metal foil, a negative electrode active material layer, and metal foil The separator-type thing which has a structure which laminated | stacked the cathode comprised by the separator and impregnated electrolyte solution is known.

On the other hand, as disclosed in, for example, Patent Document 2 (Japanese Patent Laid-Open No. 2011-70788), an all-solid-type lithium ion that does not include a separator and has a structure in which an anode, an electrolyte layer, and a cathode are laminated. Secondary batteries are also known.

Here, in increasing the capacity of the lithium ion secondary battery and improving the fast charge / discharge characteristics, the reaction between the positive electrode active material, the negative electrode active material, and the electrolyte becomes a constant rate, so that the gap between the positive electrode and the negative electrode is as narrow as possible, and the electrode area of the positive electrode and the negative electrode is as small as possible. It is important to make the size as large as possible, and paying attention to this point, Patent Document 2 discloses an active material layer having a concave-convex structure (a high aspect ratio convex active material portion coated in a line shape). A method for producing an all-solid-state battery having an electrode of three-dimensional structure has been proposed.

Japanese Patent Laid-Open No. 2008-288214 Japanese Patent Laid-Open No. 2011-70788

However, in the separator type lithium ion secondary battery in the patent document 1, when the active material layer having the uneven structure as proposed in the patent document 2 is adopted for the large capacity and the high-speed charge-discharge characteristics, For example, opposing convex positive electrode active material portions enter the concave portions between adjacent convex negative electrode active material portions, and the separator may be damaged. If the separator is damaged, the positive electrode active material portion and the negative electrode active material portion may be short-circuited and the battery function may be lost.

That is, the active material layer which has the uneven structure of the all-solid-type lithium ion secondary battery proposed by the said patent document 2 is employ | adopted as it is to a separator type lithium ion secondary battery as disclosed by the said patent document 1. It was difficult to do.

In view of the above problems, an object of the present invention is a separator type lithium ion 2 having a large capacity and excellent high-speed charge / discharge characteristics without damaging the separator even if it includes an active material layer composed of an active material portion having a high aspect ratio uneven structure. It is to provide a car battery.

In order to solve the above problems, the present inventors,

A first electrode having a first current collector and a first active material layer formed of a plurality of convex first active material portions provided on the first current collector;

A second electrode having a second current collector and a second active material layer formed of a plurality of convex second active material portions provided on the second current collector,

A separator positioned between the first electrode and the second electrode,

The first electrode and the second electrode are laminated so as to face the convex first active material part between adjacent convex second active material parts,

Provided is a lithium ion secondary battery, wherein the convex first active material portion does not enter between the convex second active material portions.

According to the lithium ion secondary battery of this invention which has such a structure, even if it is equipped with the active material layer comprised from the active material part which has a high aspect ratio uneven structure, the convex linear 2nd active material part of a convex shape which opposes is provided. Since it does not enter between an active material part, breakage of a separator can be prevented effectively, and a separator type lithium ion secondary battery excellent in high capacity | capacitance and high speed charge-discharge characteristic can be implement | achieved.

More specifically, the lithium ion secondary battery of the said invention can employ | adopt the following 1st Embodiment and 2nd Embodiment, for example.

First, the first embodiment of the present invention,

A first electrode having a first current collector and a plurality of substantially convex linear first active material portions provided on a surface of the first current collector;

A second electrode having a second current collector and a plurality of substantially convex linear second active material portions provided on the surface of the second current collector;

A separator positioned between the first electrode and the second electrode,

The first electrode and the second electrode are stacked such that the linear first active material portion and the linear second active material portion face each other.

When viewed from a direction substantially perpendicular to the surfaces of the first current collector and the second current collector, the first electrode and the first electrode are disposed in a positional relationship where the linear first active material portion and the linear second active material portion intersect. Provided is a lithium ion secondary battery characterized by overlapping two electrodes.

According to the lithium ion secondary battery of this invention which has such a structure, even if it is equipped with the active material layer comprised from the active material part which has a high aspect ratio uneven structure, the convex linear 2nd active material part of a convex shape which opposes is provided. Since it does not enter between an active material part, breakage of a separator can be prevented effectively, and a separator type lithium ion secondary battery excellent in high capacity | capacitance and high speed charge-discharge characteristic can be implement | achieved.

In the lithium ion secondary battery of the present invention,

When viewed from a direction substantially perpendicular to the surfaces of the first current collector and the second current collector, the first electrode and the plurality of linear second active material portions intersect with each other in a positional relationship. It is preferable that the said 2nd electrode overlaps.

According to the lithium ion secondary battery of this invention which has such a structure, even if it is equipped with the active material layer comprised from the active material part which has a high aspect ratio uneven structure, the convex linear 2nd active material part of a convex shape which opposes is provided. Since the linear first active material portion and the linear second active material portion are in contact with each other even when pressed in the stacked state without being interposed between the active material portions, the force applied to the separator tends to be dispersed, thereby effectively breaking the separator. It can prevent, and can realize the separator type lithium ion secondary battery which was large capacity and was excellent in a high speed charge-discharge characteristic.

Moreover, in the lithium ion secondary battery of the said invention,

When viewed from a direction substantially perpendicular to the surfaces of the first current collector and the second current collector, the first electrode and the linear active material portion are substantially perpendicular to each other in a positional relationship in which they are orthogonal to each other. It is preferable that 2nd electrode overlaps.

According to the lithium ion secondary battery of this invention which has such a structure, even if it is equipped with the active material layer comprised from the active material part which has a high aspect ratio uneven structure, the convex linear 2nd active material part of a convex shape which opposes is provided. Since the linear first active material portion and the linear second active material portion can come into contact with each other even when pressurized in a stacked state without entering between the active material portions, the effect that the force applied to the separator is easily dispersed is most remarkable. Thus, breakage of the separator can be prevented more effectively, and a large capacity and separator type lithium ion secondary battery excellent in fast charge and discharge characteristics can be reliably realized.

Moreover, this invention relates also to the method of manufacturing the lithium secondary battery of the said invention, Specifically, this invention,

A first electrode forming step of forming a plurality of convex linear first active material portions substantially parallel to each other on a surface of a first current collector to obtain a first electrode,

A second electrode formation step of obtaining a second electrode by forming a plurality of convex linear second active material portions substantially parallel to each other on the surface of the second current collector;

A laminate formation step of obtaining a laminate by laminating the first electrode and the second electrode via a separator so that the first active material portion and the second active material portion face each other;

In the laminate formation step, when viewed from a direction substantially perpendicular to the surfaces of the first current collector and the second current collector, the positional relationship where the linear first active material portion intersects with the linear second active material portion The first electrode and the second electrode are laminated so as to produce a lithium ion secondary battery.

According to the manufacturing method of the lithium ion secondary battery of this invention which has such a structure, even if it has an active material layer comprised from the active material part which has a high aspect ratio uneven structure, the convex linear 1st active material part of the convex shape which opposes is provided. Since it does not enter between the linear 2nd active material part, breakage of a separator can be prevented effectively and a separator type lithium ion secondary battery excellent in high capacity and high speed charge-discharge characteristics can be manufactured.

In the manufacturing method of the lithium ion secondary battery of the said invention,

In the laminate forming step, when the linear first active material portion intersects the plurality of linear second active material portions when viewed in a direction substantially perpendicular to the surfaces of the first current collector and the second current collector. Relationship,

It is preferable to laminate the first electrode and the second electrode.

According to the manufacturing method of the lithium ion secondary battery of this invention which has such a structure, even if it has an active material layer comprised from the active material part which has a high aspect ratio uneven structure, the convex linear 1st active material part of the convex shape which opposes is provided. Since it does not enter between the linear second active material portion, and the linear first active material portion and the linear second active material portion are in contact with each other at a plurality of points, the force applied to the separator tends to be dispersed, thus preventing breakage of the separator more effectively. Therefore, a separator type lithium ion secondary battery having a large capacity and excellent fast charging and discharging characteristics can be manufactured.

Moreover, in the manufacturing method of the lithium ion secondary battery of the said invention,

In the laminate formation step, the positional relationship where the linear first active material portion and the linear second active material portion are substantially orthogonal when viewed in a direction substantially perpendicular to the surfaces of the first current collector and the second current collector. It is preferable that the first electrode and the second electrode are laminated so as to be.

According to the lithium ion secondary battery of this invention which has such a structure, even if it is equipped with the active material layer comprised from the active material part which has a high aspect ratio uneven structure, the convex linear 2nd active material part of a convex shape which opposes is provided. Since the linear first active material portion and the linear second active material portion can come into contact with each other at the maximum number of points, the effect that the force applied to the separator tends to be easily dispersed can be most remarkably utilized. Can be prevented more effectively, and a separator type lithium ion secondary battery having a large capacity and excellent high-speed charge / discharge characteristics can be reliably manufactured.

According to a second embodiment of the present invention,

A first electrode having a first current collector and a first active material layer formed of a plurality of convex first active material portions provided on the first current collector;

A second electrode having a second current collector and a second active material layer formed of a plurality of convex second active material portions provided on the second current collector,

A separator positioned between the first electrode and the second electrode,

The first electrode and the second electrode are laminated so as to face the convex first active material part between adjacent convex second active material parts,

The convex first active material part is larger in size than the space between the convex second active material parts, and the convex first active material part has a configuration that does not enter between the convex second active material parts. Provide a secondary battery.

Even if the lithium ion secondary battery of this invention which has such a structure is equipped with the active material layer which has a high aspect-ratio uneven structure, the convex 1st active material part in a 1st active material layer is made to oppose the 2nd active material layer. As a result, the breakage of the separator can be effectively prevented from entering between adjacent convex second active material portions, and a separator type lithium ion secondary battery excellent in high capacity and high speed charge / discharge characteristics can be reliably realized.

In the lithium ion secondary battery of the present invention, the width Wa ₁ and Wa _{2 of} two adjacent sides of the upper end of the convex first active material part and the upper end of the convex second active material part facing the two sides (space ), The distances Wb ₁ and Wb ₂ are

Relationship (1): Wa ₁ > Wb ₁ and

Relationship (2): Wa ₂ > Wb ₂

Is satisfied.

The lithium ion secondary battery of this invention which has such a structure is a convex shape in a 1st active material layer, for example, when the said convex 1st active material part and the said convex 2nd active material part are linear or substantially prismatic. Separator type lithium ion having a large capacity and excellent high-speed charge / discharge characteristics because the first active material portion does not enter between adjacent convex second active material portions in the opposing second active material layer, thereby effectively preventing breakage of the separator. The secondary battery can be surely realized.

Therefore, in the lithium ion secondary battery of the present invention, even when the convex first active material portion and the convex second active material portion are each linear, the convex first active material portion and the convex second active material portion are approximately each. A prismatic shape may be sufficient.

In the case of linearity, that is, in the lithium ion secondary battery of this invention, each of the convex 1st active material part and the convex 2nd active material part is comprised so that it may form what is called a line-and-space pattern. At this time, the convex first active material part is positioned to face a concave portion between adjacent convex second active material parts.

The lithium ion secondary battery of this invention which has such a structure is able to increase the contact area of a convex 1st active material part, a convex 2nd active material part, and electrolyte layer, and is a large capacity and excellent separator with high speed charge-discharge characteristics. Can realize the lithium ion secondary battery more reliably.

In the lithium ion secondary battery of the present invention, the widths Wa ₁ and Wa ₂ of the convex first active material part are 100 to 150 μm, and the distances Wb ₁ and Wb ₂ are 50 between the upper ends of the convex second active material parts. It is preferable that it is -90 micrometers.

The lithium ion secondary battery of this invention which has such a structure satisfies the said relation more reliably, and the convex-shaped 2nd which convex-shaped 1st active material part in a 1st active material layer adjoins in the opposing 2nd active material layer. The breakage of the separator can be effectively prevented from entering between the active material portions, and a large capacity and separator type lithium ion secondary battery excellent in high speed charge and discharge characteristics can be reliably realized. Moreover, it is easy to ensure these heights with respect to the width | variety of a convex 1st active material part and a convex 2nd active material part, and the active material layer which has a high aspect ratio uneven structure can be provided.

Moreover, in the lithium ion secondary battery of the said invention, it is preferable that height Ha of the said convex 1st active material part, and height Hb of the said convex 2nd active material part are 50-100 micrometers, respectively.

The lithium ion secondary battery of this invention which has such a structure has the merit that the resistance of a convex 1st active material part and a convex 2nd active material part does not rise too much, and the fall of a charge / discharge capacity can be prevented.

According to the present invention, even if an active material layer composed of an active material portion having a high aspect ratio uneven structure, a separator type lithium ion secondary battery having a large capacity and excellent high-speed charge and discharge characteristics can be obtained without damaging the separator.

1 is a schematic longitudinal cross-sectional view of a first embodiment of a lithium ion secondary battery of the present invention.
FIG. 2 shows the positions of the convex linear negative electrode active material portion 12a and the convex linear positive electrode active material portion 16a which are projected from the direction of arrow Z _{1 in} the lithium ion secondary battery 1 shown in FIG. 1. Schematic diagram showing the relationship.
FIG. 3: is a schematic diagram which shows the form of linear negative electrode active material part 12a (cathode active material layer 12) by the nozzle dispense method with respect to the lithium ion secondary battery 1 shown in FIG.
FIG. 4 shows a linear negative electrode active material portion 22a and a linear positive electrode active material portion which are projected from the direction of arrow Z ₁ in FIG. 1 as in FIG. 2 in the first modified embodiment of the lithium ion secondary battery of the present invention. It is a schematic diagram which shows the positional relationship of 26a).
FIG. 5 shows a linear negative electrode active material portion 32a and a linear positive electrode active material portion which are projected from the direction of arrow Z ₁ in FIG. 1 in the second modified embodiment of the lithium ion secondary battery of the present invention. It is a schematic diagram which shows the positional relationship of 36a).
6 is a schematic longitudinal sectional view of a second embodiment of a lithium ion secondary battery of the present invention.
FIG. 7 shows the upper end of the linear convex negative active material portion 12a and the linear convex positive active material portion 16a projected from the direction of arrow Z _{1 in} the lithium ion secondary battery 1 shown in FIG. 6. It is a schematic diagram which shows the positional relationship of an upper stage.
FIG. 8 is a schematic view showing the convex negative electrode active material portion 12a (the negative electrode active material layer 12) formed by the nozzle dispensing method for the lithium ion secondary battery 1 shown in FIG. 6.
FIG. 9 is a variation of the lithium ion secondary battery of the present invention, in which a part of the substantially prismatic convex negative active material portion 22a, which is projected from the direction of arrow Z ₁ in FIG. 6, similarly to FIG. 7. It is a schematic diagram which shows the positional relationship of the upper end and the upper end of the substantially prismatic convex positive electrode active material part 26a.

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment of the lithium ion secondary battery of this invention is described referring drawings, this invention is not limited only to these. In addition, in the following description, the same code | symbol is attached | subjected to the same or equivalent part, and the overlapping description may be abbreviate | omitted. In addition, since the drawings are intended to conceptually describe the present invention, there may be cases in which the dimensions, ratios, or numbers are exaggerated or simplified in order to facilitate understanding. In addition, in this specification, X, Y, and Z coordinate direction is defined as shown in each figure.

[First Embodiment]

In the present embodiment, the present invention will be described with the lithium ion secondary battery having the structure shown in FIG. 1 as a representative. 1 is a schematic longitudinal sectional view of an embodiment of a lithium ion secondary battery of the present invention. 2 is a convex linear negative electrode active material portion 12a and a convex linear positive electrode active material portion 16a which are projected from the direction of arrow Z _{1 in} the lithium ion secondary battery 1 shown in FIG. 1. Is a schematic diagram showing the positional relationship of

In addition, although it mentions later in detail, FIG. 3 forms the convex-shaped negative electrode active material part 12a (cathode active material layer 12) by the nozzle dispense method with respect to the lithium ion secondary battery 1 shown in FIG. 4 and 5 are projections from the direction of arrow Z ₁ in FIG. 1, similarly to FIG. 2, in the first and second modified embodiments of the lithium ion secondary battery shown in FIG. 1, respectively. A schematic diagram showing the positional relationship between the linear negative electrode active material portions 22a and 32a and the linear positive electrode active material portions 26a and 36a.

As shown in FIG. 1, the lithium ion secondary battery 1 of the present embodiment has a structure in which a negative electrode (first electrode) A, a separator 20, and a positive electrode (second electrode) C are stacked. The electrolyte is filled between the cathode A and the anode C to form the electrolyte layer 14, and the separator 20 is also impregnated with the electrolyte.

The negative electrode A is a negative electrode active material layer (first active material layer) 12 composed of a substantially rectangular negative electrode current collector (first current collector) 10 and a linear negative electrode active material portion (linear first active material portion) 12a. The positive electrode C is a positive electrode active material layer (second active material layer) including a substantially rectangular positive electrode current collector (second current collector) 18 and a linear positive electrode active material portion (linear second active material portion) 16a. ), The negative electrode current collector 10 and the positive electrode current collector 18 are stacked so that the linear negative electrode active material portion 12a and the linear positive electrode active material portion 16a face each other.

Here, as shown in FIG. 2, on the surface of the negative electrode current collector 10 of the negative electrode A, a plurality of convex linear negative electrode active material portions 12a are provided substantially parallel to each other with a space therebetween so that the negative electrode active material layer 12 On the surface of the positive electrode current collector 18 of the positive electrode C, a plurality of convex linear positive electrode active material portions 16a are provided on the surface of the positive electrode current collector 18 substantially parallel to each other to constitute the positive electrode active material layer 16. That is, the linear negative electrode active material part 12a and the linear positive electrode active material part 16a in this embodiment are formed so that it may have what is called a line and space pattern shape.

Then, the lithium ions of the present embodiment, the secondary battery 1 includes a negative electrode current collector 10 and the positive electrode current collector is approximately perpendicular to the surface of the body 18 direction of the line cathode active material from (that is, the direction of the arrow Z ₁₎ In the case where the portion 12a and the linear positive electrode active material portion 16a are projected, the linear negative electrode active material portion 12a and the linear positive electrode active material portion 16a intersect at an angle α ₁ in the portion C ₁ . Has characteristics.

That is, on the negative electrode current collector 10, the plurality of convex linear linear active material portions 12a constituting the negative electrode active material layer 12 are formed on the negative electrode current collector 10 as shown in FIG. 2. It is formed at intervals so as to extend crosswise at an angle α ₁ with respect to the direction of the arrow Y. In contrast, on the positive electrode current collector 18, the plurality of convex linear positive electrode active material portions 16a constituting the positive electrode active material layer 16 extend along the direction of arrow Y, as shown in FIG. 2. It is formed at intervals if possible.

According to the lithium ion secondary battery 1 of this embodiment which has such a structure, the high aspect ratio uneven structure comprised by the convex linear negative electrode active material part 12a and the convex linear linear active material part 16a, respectively, is made. Even if the branch includes the negative electrode active material layer 12 and the positive electrode active material layer 16, the linear negative electrode active material portion 12a does not enter between the opposing linear positive electrode active material portions 16a, so that the stress due to the lamination is reduced to the separator ( 20) It is hard to be caught. On the contrary, since the linear positive electrode active material part 16a does not enter between the opposing negative electrode active material parts 12a, the stress by lamination is hard to apply to the separator 20, either.

Therefore, the lithium ion secondary battery 1 of this embodiment has a structure which can effectively prevent the linear negative electrode active material part 12a and the linear positive electrode active material part 16a from breaking through the separator 20 or breaking. It has a large capacity, excellent fast charging and discharging characteristics, and reliability.

In addition, in the lithium ion secondary battery 1 of this embodiment, the width | variety and space | interval of the linear negative electrode active material part 12a and the linear positive electrode active material part 16a realize the structure of this invention, and are effective. Although it can select suitably in the range which does not harm, For example, the width should be about 100-150 micrometers, and the space should just be about 50-90 micrometers. If it is such a range, it will be easy to make the linear negative electrode active material part 12a and the linear positive electrode active material part 16a into a high aspect ratio.

Moreover, although the height of the linear negative electrode active material part 12a and the linear positive electrode active material part 16a can also be suitably selected in the range which implements the structure of this invention and does not impair an effect, For example, if it is about 50-100 micrometers, respectively, do. If it is such a range, the resistance of the linear negative electrode active material part 12a and the linear positive electrode active material part 16a will not increase too much, and the fall of charge / discharge capacity can be prevented more reliably.

Here, as the negative electrode current collector 10, a known material can be used in the technical field to which the present invention belongs, but for example, a metal film such as aluminum foil may be used. In addition, although not shown, this negative electrode current collector 10 may be formed on the surface of an insulating base material. What is necessary is just to use the flat member formed from an insulating material as such a base material, and resin, glass, ceramics, etc. are mentioned as such an insulating material, for example. In addition, the substrate may be a flexible substrate having flexibility.

As the negative electrode active material included in the linear negative electrode active material portion 12a, those commonly used in the technical field of the present invention can be used. For example, metals, metal fibers, carbon materials, oxides, nitrides, silicon, silicon compounds, tin, A tin compound, various alloy materials, etc. are mentioned. Among these, in consideration of the size of the capacity density and the like, oxides, carbon materials, silicon, silicon compounds, tin, tin compounds and the like are preferable. As the oxide, for example, the formula: may be mentioned lithium titanate, such as represented by Li ₄ Ti ₅ O _12. As a carbon material, various natural graphite (graphite), coke, graphitized patterned carbon, carbon fiber, spherical carbon, various artificial graphite, amorphous carbon, etc. are mentioned, for example. As a silicon compound, a silicon containing alloy, a silicon containing inorganic compound, a silicon containing organic compound, a solid solution, etc. are mentioned, for example. As a specific example of a silicon compound, for example, silicon oxide represented by SiO _a (0.05 <a <1.95), silicon and Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Sn and Ti Some of the alloys, silicon, silicon oxides or silicon contained in the alloys comprising at least one element selected from B, Mg, Ni, Ti, Mo, Co, Ca, Cr, Cu, Fe, Mn, Nb, And silicon compounds or silicon-containing alloys substituted with at least one element selected from Ta, V, W, Zn, C, N and Sn, and solid solutions thereof. As the tin compound includes, for example, a _{SnO b (0 <b <2} ), SnO 2, SnSiO 3, Ni 2 Sn 4, Mg 2 Sn and the like. A negative electrode active material may be used individually by 1 type, and may be used in combination of 2 or more type as needed.

In addition, the linear negative electrode active material portion 12a may include a conductive aid. As the conductive aid, those commercially available in the technical field of the present invention can be used. For example, graphite such as natural graphite and artificial graphite, acetylene black, ketjen black, channel black, furnace black, lamp black, thermal black, etc. Conductive fibers such as carbon blacks, carbon fibers and metal fibers, metal powders such as carbon fluoride and aluminum, conductive whiskers such as zinc oxide, conductive metal oxides such as titanium oxide, organic conductive materials such as phenylene derivatives, and the like. Can be mentioned. A conductive agent can be used individually by 1 type, or can be used in combination of 2 or more type as needed.

As described above, the lithium ion secondary battery 1 of the present embodiment opposes the negative electrode A composed of the negative electrode current collector 10 and the negative electrode active material layer 12, and is the positive electrode active material layer 16 and the positive electrode current collector. The anode C constituted by (18) is laminated, and has a configuration in which the electrolyte layer 14 and the separator 20 are provided between the cathode A and the anode C. Therefore, in the lithium ion secondary battery 1 of this embodiment, it has a space with airtightness between the negative electrode A and the positive electrode C, the electrolyte solution is filled in this space, and the electrolyte layer 14 is formed, and the separator 20 ) Also has a composition impregnated with electrolyte.

As the separator 20, a porous film, a nonwoven fabric, etc. which showed the outstanding high rate discharge performance can be used individually or in combination. Examples of the material constituting the separator 20 include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polyvinylidene fluoride, and vinylidene fluoride-hexafluoride. Propylene copolymer, vinylidene fluoride-perfluorovinylether copolymer, vinylidene fluoride-tetrafluoroethylene copolymer, vinylidene fluoride-trifluoroethylene copolymer, vinylidene fluoride-fluoroethylene copolymer, vinylidene fluoride-hexafluoro Acetone copolymer, vinylidene fluoride-ethylene copolymer, vinylidene fluoride-propylene copolymer, vinylidene fluoride-trifluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene copolymer, vinylidene fluoride-ethylene- Tetrafluoroethylene copolymer etc. are mentioned.

In the separator 20, a polymer gel composed of a polymer such as acrylonitrile, ethylene oxide, propylene oxide, methyl methacrylate, vinyl acetate, vinylpyrrolidone, polyvinylidene fluoride, and an electrolyte, for example. You can also use

As the electrolyte solution constituting the electrolyte layer 14, a conventionally known electrolyte solution containing a lithium salt and an organic solvent can be used. Examples of lithium salts include lithium hexafluorophosphate (LiPF ₆ ), lithium perchlorate (LiClO ₄ ), lithium bistrifluoromethanesulfonylimide (LiTFSI), and the like. Moreover, ethylene carbonate, diethylene carbonate, ethyl methyl carbonate, etc. are mentioned as an organic solvent, for example, A mixture thereof can also be used.

On the positive electrode current collector 18, it is similar to the negative electrode active material layer 12 made of the convex linear negative electrode active material portion 12a on the negative electrode current collector 10, and a convex linear positive electrode active material containing a positive electrode active material. The positive electrode active material layer 16 which consists of the part 16a is provided. However, in the lithium ion secondary battery 1 of this embodiment, the linear negative electrode active material part 12a and the linear positive electrode active material part 16a are arrange | positioned so that it may cross at an angle (alpha) ₁ as above.

As the anode current collector 18, a well-known material in the technical field to which the present invention belongs can be used, and for example, a metal film such as copper foil can be used. In addition, similar to the negative electrode current collector 10, the positive electrode current collector 18 may be formed on the surface of an insulating base material. What is necessary is just to use the flat member formed from an insulating material as such a base material, and resin, glass, ceramics, etc. are mentioned as such an insulating material, for example. In addition, the substrate may be a flexible substrate having flexibility.

As a positive electrode active material (powder) which the linear positive electrode active material part 16a contains, a lithium containing composite metal oxide, a chalcogen compound, manganese dioxide, etc. are mentioned, for example. The lithium-containing composite metal oxide is a metal oxide containing lithium and a transition metal or a metal oxide in which a part of the transition metal in the metal oxide is substituted by a dissimilar element. Here, as the different element, for example, Na, Mg, Sc, Y, Mn, Fe, Co, Ni, Cu, Zn, Al, Cr, Pb, Sb, B and the like can be cited, and Mn, Al, Co , Ni, Mg and the like are preferred. The number of the different elements may be one or two or more. Among these, lithium containing composite metal oxide can be used preferably. As the lithium-containing composite metal oxide, for example, Li _x CoO _2, Li _x NiO _2, Li _x MnO _2, Li _x Co _y Ni _{1 - y} O _2, Li _x Co _y M _{1 - y} O _z, Li _x Ni _{1 - y} M _y O _z , Li _x Mn ₂ O ₄ , Li _x Mn _2-y M _y O ₄ , LiMPO ₄ , Li ₂ MPO ₄ F (In each formula, for example, M is Na, Mg At least one selected from the group consisting of Sc, Y, Mn, Fe, Co, Ni, Cu, Zn, Al, Cr, Pb, Sb, V, and B. 0 <x≤1.2, 0 <y≤0.9, 2.0≤z≤2.3), LiMeO ₂ (wherein, Me = MxMyMz; Me and M, and the like transition metals, x + y + z = 1 ). Specific examples of the lithium-containing composite metal oxide, examples thereof include, for example, there may be mentioned _{LiNi 1/3 Mn 1/3} Co 1/3 O 2, LiNi 0 .8 Co 0 .15 Al 0 .05 O 2 or the like. Here, x value which shows the molar ratio of lithium in each said formula increases or decreases by charging / discharging. Moreover, as a chalcogen compound, titanium bisulfide, molybdenum bisulfide, etc. are mentioned, for example. A positive electrode active material can be used individually by 1 type, and may use 2 or more types together. The positive electrode active material layer 16 may contain the conductive aid described above with respect to the negative electrode active material layer 12.

As described above, the negative electrode current collector 10, the negative electrode active material layer 12, the electrolyte layer 14, the separator 20, the electrolyte layer 14, the positive electrode active material layer 16, and the positive electrode current collector 18 are used. The lithium ion secondary battery 1 of this embodiment is formed.

In addition, although not shown, the lithium ion battery secondary battery 1 may be provided with a tab electrode as appropriate, and the plurality of lithium ion battery secondary batteries 1 may be connected in series and / or in parallel. A lithium ion secondary battery device can also be comprised.

The lithium ion secondary battery 1 of this embodiment which has such a structure can be comprised thin and bendable. In addition, since the negative electrode active material layer 12 and the positive electrode active material layer 16 have a three-dimensional structure having irregularities as shown in the figure, and the surface area with respect to the volume is increased, the negative electrode active material layer 12 and the positive electrode active material layer 16 ), The contact area between each of the electrolyte solution 14 and the electrolyte solution 14 can be largely secured, and high efficiency and high output can be obtained. Thus, the lithium ion secondary battery 1 of this embodiment can be made small and high performance.

Next, a method of manufacturing the electrode and the lithium ion secondary battery 1 in the above-described present embodiment will be described. When manufacturing the lithium ion secondary battery 1 of this embodiment, first, in the negative electrode collector 10, as shown in FIG. 3, an angle with respect to the direction of the arrow Y in FIG. 1 and FIG. A linear negative electrode active material portion 12a is formed along the direction of arrow Y ₁ intersecting with α ₁ to produce a negative electrode A having the negative electrode active material layer 12 (first electrode formation step). In the positive electrode current collector 18, a linear positive electrode active material portion 16a is formed along the direction of arrow Y in FIGS. 1 and 2 to produce a positive electrode C having the positive electrode active material layer 16 (secondary). Electrode forming process).

Next, as shown in FIG. 1, the negative electrode A and the positive electrode C are interposed between the negative electrode A and the separator 20 so that the linear negative electrode material portion 12a and the linear positive electrode active material portion 16a face each other. Anode C is laminated. At this time, also laminating the outer peripheral portion is, the anode A and cathode C to match the outer periphery and the cathode current collector 18 of the body (10) bore, a negative electrode current collector from the arrow Z ₁ in the first (laminate-forming step).

For example, the airtight sealed space is formed between the negative electrode A and the positive electrode C by the conventional method using a sealing material, etc., and the electrolyte solution is filled here to form the electrolyte layer 14, and the separator Electrolyte solution is also impregnated to (20), and the lithium ion secondary battery 1 of this embodiment is produced.

In the first electrode forming step, the linear negative electrode active material portion 12a (a) moves the nozzle for discharging the negative electrode active material material containing the negative electrode active material in a linear manner with respect to the negative electrode current collector 10, so that the negative electrode current collector An application step (ie, an application step using a nozzle dispense method) for forming a plurality of convex linear negative active material portions 12a made of a negative electrode active material material on (10), and (b) linear negative active material portions 12a. ) Can be formed by a drying step of drying.

In the application process of (a), as shown in Fig. 3A, on the main surface of the negative electrode current collector 10 (that is, on the XY plane defined in the direction of the arrow X and the direction of the arrow Y). , The linear negative electrode current collector 10 is conveyed in the direction of arrow Y ₁ having an angle α ₁ with respect to the direction of arrow Y. As a result, the nozzle 40 is moved relative to the negative electrode current collector 10. On the surface of the negative electrode current collector 10 to be conveyed, a paste-shaped negative electrode active material material is discharged from the nozzle 40 so as to form a convex linear negative electrode active material portion 12a. In this embodiment, the position of the nozzle 40 is fixed, and the nozzle 40 is moved relative to the negative electrode current collector 10 by conveying the negative electrode current collector 10.

The paste-like negative electrode active material is composed of a mixture obtained by stirring and mixing (mixing) the negative electrode active material, the conductive aid, the binder, the solvent, and the like by a conventional method, and can be discharged from the nozzle 40. What is necessary is just to have a various viscosity in the range. In this embodiment, it is preferable that it is a lower limit of 10 Pa.s and an upper limit of about 10000 Pa.s at the shear rate 1s- ¹ , for example. In addition, each component may be melt | dissolved in the solvent, and may be disperse | distributed (it includes the case where one part melts and the remainder is disperse | distributed.).

In addition, although the solid content ratio of the negative electrode active material used for the said coating process can have various solid content ratios so that a negative electrode active material material can discharge from the nozzle 40, the solid content ratio is smaller than the solid content ratio in the wet point of the said mixture. It has, and it is preferable that it is 60 mass%, for example.

Such viscosity and solid content ratio also vary depending on the type, compounding amount, size, or shape of components such as a negative electrode active material, a conductive aid, a binder, and a solvent, but the negative electrode active material, the conductive aid, a binder, a solvent, and the like. It can adjust according to the length of the kneading | mixing time at the time of stirring and mixing (kneading) by a conventional method.

As the binder, those commercially available in the technical field of the present invention can be used. For example, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyethylene, polypropylene, aramid resin, polyamide, polyimide , Polyamideimide, polyacrylonitrile, polyacrylic acid, polyacrylic acid methyl ester, polyacrylic acid ethyl ester, polyacrylic acid hexyl ester, polymethacrylic acid, polymethacrylic acid methyl ester, polymethacrylic acid ethyl ester, polymethacrylic acid Hexyl ester, polyvinyl acetate, polyvinylpyrrolidone, polyether, polyethersulfone, polyhexafluoropropylene, styrene-butadiene rubber, ethylene-propylene diene copolymer, carboxymethyl cellulose and the like. Moreover, the air of the monomer compound selected from tetrafluoroethylene, hexafluoropropylene, perfluoroalkyl vinyl ether, vinylidene fluoride, chlorotrifluoroethylene, ethylene, propylene, pentafluoropropylene, fluoromethyl vinyl ether, acrylic acid, hexadiene, etc. Coalescing may be used as a binder. A binder can be used individually by 1 type, or can be used in combination of 2 or more type as needed.

As the solvent, it is preferable to use an organic solvent except water so as not to decompose lithium hexafluorophosphate (LiPF ₆ ) or the like contained in the electrolytic solution layer 14. As such an organic solvent, those commonly used in the technical field of the present invention can be used. For example, dimethylformamide, dimethylacetamide, methylformamide, N-methyl-2-pyrrolidone (NMP), dimethylamine , Acetone, cyclohexanone and the like. An organic solvent can be used individually by 1 type, or can mix and use 2 or more types.

3A is a side view schematically showing a state in which the linear negative electrode active material portion 12a constituting the negative electrode active material layer 12 is formed by a nozzle dispense method (i.e., the negative electrode current collector to be conveyed ( And (b) of FIG. 3 shows the linear negative electrode active material portion 12a constituting the negative electrode active material layer 12 by the nozzle dispensing method. It is a perspective view which shows typically how to form.

In this nozzle dispensing method, the negative electrode 40 is provided with a plurality of nozzles 40 provided with a plurality of discharge ports for discharging the negative electrode active material material, which is a coating liquid, above the negative electrode current collector 10, and discharges a predetermined amount of negative electrode active material material from the discharge holes. The current collector 10 is conveyed at a constant speed in the direction of an arrow Y ₁ relative to the nozzle 40. By doing so, on the negative electrode current collector 10, a plurality of convex linear negative electrode active material portions 12a made of a negative electrode active material material are formed along the Y ₁ direction and coated so as to form a pattern of stripe-shaped line and space.

By providing a plurality of discharge ports in the nozzle 40, a plurality of convex linear negative electrode active material portions 12a can be formed to have a stripe shape, and the conveyance of the negative electrode current collector 10 is continued, whereby the negative electrode current collector ( The convex linear anode active material portion 12a extending over the entire surface of 10) can be formed in a stripe shape.

Since the plurality of convex linear linear active material portions 12a made of the negative electrode active material material formed as described above are still in a coating film state including a solvent or the like, the negative electrode current collector 10 provided with the linear negative active material portions 12a is provided. Is conveyed so that it may pass through lower areas, such as a blower which is a drying means, for example, and a drying process is performed by dry air. Thereby, the negative electrode A containing the negative electrode active material layer 12 which consists of the linear negative electrode active material part 12a formed in the surface of the negative electrode collector 10 and the negative electrode collector 10 can be obtained.

The drying temperature and drying time of a drying process can be suitably selected by those skilled in the art. The drying temperature should just be a range which can dry the linear negative electrode active material part 12a, and can fix the shape, For example, in the range of 5 to 150 degreeC, Preferably it is the range of normal temperature (23 degreeC)-80 degreeC What is necessary is just temperature inside. Moreover, drying time can also be controlled by the conveyance speed of the negative electrode collector 10.

Next, the formation of the positive electrode active material layer 16 on the positive electrode current collector 18 can also be performed in the same manner as the formation of the negative electrode active material layer 12 on the negative electrode current collector 10. The anode C can be obtained by this. However, in the present embodiment, since the linear negative electrode active material portion 12a and the linear positive electrode active material portion 16a have an angle α ₁ as described above, the two opposite sides of the substantially rectangular positive electrode current collector 18 are provided. The positive electrode current collector 18 and the nozzle are relatively moved so that the nozzle is conveyed in the direction parallel to the direction.

The negative electrode A and the positive electrode C obtained as described above are laminated in the state where the negative electrode active material layer 12 and the positive electrode active material layer 16 are opposed to each other through the separator 20 in a space having airtightness, and the separator 20 and the said The electrolyte solution is filled in the space to form the electrolyte layer 14, thereby preparing the lithium ion secondary battery 1 of the present embodiment.

`` First Modified Aspect ''

As mentioned above, although an example of embodiment of this invention was described, this invention is not limited only to these. For example, a cross with In, in the case of this by the projection from the direction of the arrow Z ₁ in Fig. 1, one line cathode active material portion (12a) is in one place on board the positive electrode active material part (16a) according to the embodiment However, one linear negative electrode active material portion may cross the linear positive electrode active material portion at a plurality of locations.

FIG. 4 is a projection from the direction of arrow Z ₁ in FIG. 1 similarly to FIG. 2 in the lithium ion secondary battery 2 according to the first modified embodiment of the lithium ion secondary battery 1 of the above embodiment. Is a schematic diagram showing the positional relationship between the linear negative electrode active material portion 22a and the linear positive electrode active material portion 36a.

In this second modification, a plurality of convex linear negative electrode active material portions 22a constituting the negative electrode active material layer 12 are arranged on the negative electrode current collector 10, as shown in FIG. 4. On the whole 10, it forms at intervals so that it may cross and extend at the angle (alpha) ₂ (> (alpha) ₁ ) with respect to the direction of the arrow Y. On the other hand, on the positive electrode current collector 18, the plurality of convex linear positive electrode active material portions 26a constituting the positive electrode active material layer 16 extend along the direction of arrow Y, as shown in FIG. 4. It is formed at intervals if possible. As a result, the crossing line and one negative electrode active material portion (22a) is part of C ₁ and the positive electrode active material part line part (26a) in the second portion of the C _2.

According to the lithium ion secondary battery 2 having such a structure, the negative electrode active material layer and the positive electrode active material layer constituted by the linear negative electrode active material portion 22a and the linear positive electrode active material portion 26a having a high aspect ratio uneven structure are provided. Even if it exists, the convex linear negative electrode active material part 22a does not enter between the opposing convex linear positive electrode active material parts 26a in the laminated state.

Further, the force applied to the separator 20 is distributed, because even if pressurized with a laminated structure, the portion C _1, and are being met linear negative electrode active material portion (22a) and the line cathode active material portions (26a) in the second portion of the portion C ₂ It is easy to prevent damage of the separator 20 more effectively, and it can be set as the separator type lithium ion secondary battery 2 which is large capacity and is excellent in a high speed charge-discharge characteristic. Such a lithium ion secondary battery 2 can also be manufactured similarly to the lithium ion secondary battery 1 of the said Embodiment 1.

`` Second Modified Aspect ''

In addition, for example, in the above embodiment and the first in the variant, when present in the projection from the direction of the arrow Z ₁ in Fig. 1, respectively 2 and 4, one line cathode active material Although the case where the part 12a, 22a intersects the linear positive electrode active material part 16a, 26a in one place and two place was demonstrated, the linear negative electrode active material part may be substantially orthogonal to the linear positive electrode active material part.

Figure 5 is, in the lithium ion secondary battery (3) according to the second variant of the lithium ion secondary cell 1 of the above embodiment, FIG. 2 and similarly projected from the direction of the arrow Z ₁ in the first Is a schematic diagram showing the positional relationship between the linear negative electrode active material portion 32a and the linear positive electrode active material portion 36a.

In this third modification, the plurality of convex linear negative electrode active material portions 22a constituting the negative electrode active material layer 12 are arranged on the negative electrode current collector 10, as shown in FIG. 5. Formed at intervals in the X direction so as to extend in the direction of arrow X on the whole 10 at an angle α ₃ (= 90 °> α ₂ > α ₁ ) with respect to the direction of arrow Y have. On the other hand, on the positive electrode current collector 18, the plurality of convex linear active material portions 36a constituting the positive electrode active material layer 16 extend along the direction of arrow Y, as shown in FIG. 5. It is formed at intervals if possible. As a result, the crossing line and one negative electrode active material portion (22a) is part of C ₁ and the positive electrode active material part line part (26a) in the second portion of the C _2.

According to the lithium ion secondary battery 3 having such a structure, the negative electrode active material layer and the positive electrode active material layer constituted by the linear negative electrode active material portion 32a and the linear positive electrode active material portion 36a having the high aspect ratio uneven structure are provided. Even if it exists, the convex linear negative electrode active material part 32a does not enter between the opposing convex linear positive electrode active material parts 36a in the laminated state.

In addition, even if pressurized with a laminated structure of the section C _1, part C _2, part C _3, part C ₄ and part Cn according to a plurality of positions (not shown) on board the negative electrode active material portion (32a) and the line cathode active material portions (36a ), The force applied to the separator 20 can be easily dispersed, and thus, the breakage of the separator 20 can be prevented more effectively, and a separator type lithium ion secondary battery having a large capacity and excellent high-speed charge and discharge characteristics can be obtained. (3) can be done. In addition, in a 2nd modification, the intersection of the linear negative electrode active material part 32a and the linear positive electrode active material part 36a becomes the maximum. Such a lithium ion secondary battery 3 can also be produced in the same manner as the lithium ion secondary battery 1 of the first embodiment.

In addition to these embodiments and modified embodiments, the lithium ion secondary battery of the present invention and its manufacturing method can adopt various forms within the scope of the technical idea of the present invention.

For example, in the said embodiment, as shown in FIG. 3, the direction which cross | intersects the substantially rectangular negative electrode collector 10 by the angle (alpha) ₁ with respect to the direction of the arrow Y in FIG. 1 and FIG. Accordingly, the linear negative electrode active material portion 12a is formed to produce the negative electrode A, and the linear positive electrode active material portion is formed on the substantially rectangular positive electrode current collector 18 along the direction of arrow Y in FIGS. 1 and 2. The positive electrode C was formed by forming the positive electrode C. Then, the negative electrode A and the positive electrode C were faced with the linear negative electrode material portion 12a and the linear positive electrode active material portion 16a facing each other, as shown in FIG. 1. stacking the a and cathode C, and at this time, also from the arrow Z ₁ in the first, so as to match the bore, the outer peripheral portion of the outer periphery and the cathode current collector 18 of the negative electrode collector 10 laminated anode a and cathode C did.

On the contrary, for example, in the negative electrode current collector and the positive electrode current collector, the linear negative electrode active material portion and the linear positive electrode active material portion are formed to extend in the same direction, respectively, to produce a negative electrode and a positive electrode, and the surface of the negative electrode current collector and the positive electrode current collector The negative electrode and the positive electrode may be rotated and laminated so that the linear negative electrode active material portion and the linear positive electrode active material portion cross each other in a substantially vertical direction. In this case, the shapes of the negative electrode current collector and the positive electrode current collector may be determined in advance in accordance with the angle by determining the angle of rotation in advance.

Moreover, the dimension and space | interval of a linear negative electrode active material part and a linear positive electrode active material part in the lithium ion secondary battery of this invention are not limited to the said embodiment and a modified aspect, It is possible to adjust suitably.

Moreover, in the said embodiment and the modified aspect, although the case where both the linear negative electrode active material part and the linear positive electrode active material part were formed in a fixed space on the negative electrode current collector and the positive electrode current collector respectively was demonstrated, the linear negative electrode active material In the base part (namely, the part which faces a negative electrode electrical power collector and a positive electrode electrical power collector) of a part and linear positive electrode active material part, adjacent linear negative electrode active material parts or linear positive electrode active material parts may be continuous.

Moreover, in the said embodiment and the modified aspect, since the application | coating by the nozzle dispense method is applied to formation of the linear negative electrode active material part and linear linear active material part which need to have an uneven structure, various patterns can be formed in a short time. It is also possible to suitably apply the nozzle dispensing method to the formation of fine patterns.

The present invention is not limited to the above embodiment, and various changes can be made in addition to those described above without departing from the spirit thereof. For example, the coating method applied in each process is not limited to the above, As long as it meets the objective of the said process, you may apply another coating method. For example, the electrolyte solution layer in the above embodiments and modified embodiments may be a gel electrolyte layer if a separator is used. In that case, you may apply | coat an electrolyte material by a spin coat method or a spray coat method.

[Second Embodiment]

In the present embodiment, the present invention will be described with the lithium ion secondary battery having the structure shown in FIG. 6 as a representative. 6 is a schematic longitudinal cross-sectional view of an embodiment of the lithium ion secondary battery of the present invention. In addition, Figure 7, Figure lithium ion shown in FIG. 6, the secondary battery (101), wherein the convex shape of the upper (surface) and the line of the convex-shaped negative electrode active material portion (112a) of the line seen by projection from the direction of the arrow Z ₁ in It is a schematic diagram which shows the positional relationship of the upper end (surface) of the positive electrode active material part 116a.

In addition, although it mentions later in detail, FIG. 8 forms the convex negative electrode active material part 112a (cathode active material layer 112) with the nozzle dispensing method about the lithium ion secondary battery 101 shown in FIG. It is a schematic diagram which showed a state, FIG. 9: is a modified example of the lithium ion secondary battery 101 shown in FIG. 6 WHEREIN: The upper end of the substantially prismatic convex negative electrode active material part 122a, and the substantially prismatic convex positive electrode It is a schematic diagram which shows the positional relationship of the upper end of the active material part 126a.

As shown in FIG. 6, the lithium ion secondary battery 101 of the present embodiment includes a negative electrode (first electrode) A, a separator 120, and a positive electrode (second electrode) C. The electrolyte solution is filled between the anodes C to form the electrolyte layer 114, and the separator 120 is also impregnated with the electrolyte solution.

The negative electrode A includes a negative electrode current collector (first current collector) 110 and a plurality of linear convex negative active material portions (first active material portion) 112a provided with a space on the negative electrode current collector 110. Comprising a negative electrode active material layer (first active material layer) 112, the positive electrode C is a plurality of linearly arranged on the positive electrode current collector (second current collector) 118 and spaced on the positive electrode current collector 118. The positive electrode active material layer (second active material layer) 116 which consists of the convex positive electrode active material part (second active material part) 116a of this is comprised. That is, the convex negative electrode active material part 112a and the convex positive electrode active material part 116a in this embodiment are formed so that it may have what is called a line and space pattern shape.

Here, in the lithium ion secondary battery 101 of the present embodiment, as shown in FIG. 6, the negative electrode A and the positive electrode C have convex negative electrode material portions 112a between the adjacent convex positive electrode material portions 116a. ) Are laminated so as to face each other, and the largest feature is the width (length) Wa ₁ and Wa _{2 of} two adjacent sides L ₁ and L ₂ at the upper end of the convex anode active material portion 112a, and the convex cathode active material portion. As the distances Wb ₁ and Wb ₂ between the upper ends of the 116a are shown in FIG. 7,

Relationship (1): Wa ₁ &gt; Wb ₁ and

Relationship (2): Wa ₂ > Wb ₂

I am satisfied with this.

More specifically, in the lithium ion secondary battery 101 of the present embodiment, as shown in Figure 7, the convex-shaped negative electrode active material portion (112a) of the line, the direction of an arrow Z ₁ in Fig. 6 When it from the projection, a substantially rectangular shape with two sides L ₁ and L ₂ which are adjacent to perpendicular and has a shape of a thin and long rectangular shape. Similarly, when the linear convex positive electrode active material portion 16a is projected from the direction of arrow Z ₁ in FIG. 6, the linear convex positive electrode active material portion 16a has an approximately rectangular shape having two adjacently orthogonal sides and has an elongated rectangular shape. .

The upper edge M ₁ of the convex positive electrode active material portion 112a is positioned opposite the side L ₁ of the convex negative electrode active material portion 112a, and the width of the side L ₁ of the convex negative electrode active material portion 112a is located. Wa ₁ and, between the top of the convex shape positive electrode active material part (116a) (space) is the distance Wb of M _{1 1,} expression (1) satisfies the _first Wa> Wb _1.

Further, a convex shape, the change position opposite to the L ₂ of the negative electrode active material portion (112a), between the top of the convex shape positive electrode active material part (116a) (space) M ₂ is not installed, that is, convex shape positive electrode active material part (116a The distance Wb ₂ between the upper ends (space) M ₂ of 0) is 0, the width Wa ₂ of the side L ₂ of the convex anode active material part 112a, and the upper space M between the upper ends of the convex positive electrode active material part 116a (space). ₂ distance Wb ₂ (= 0) is, expression (2), and thus, satisfies the _second Wa> Wb _2.

Since the lithium ion secondary battery 101 of this embodiment has the above structures, even if the convex negative electrode active material part 112a and the convex positive electrode active material part 116a have a high aspect ratio, it is convex. The negative electrode active material portion 112a does not enter the concave portion between adjacent convex positive electrode active material portions 116a, so that the convex negative electrode active material portion 112a and the convex positive electrode active material portion 116a are separated by the separator 120. It is possible to effectively prevent damage by puncture or breakage, and a separator type lithium ion secondary battery 101 having a large capacity and excellent fast charging and discharging characteristics can be formed.

In addition, the (space) between the top of the embodiment of the lithium ion secondary cell 101. In the convex-shaped negative electrode active material portion (112a), the width Wa ₁ is a 100 ~ 150μm, convex shape positive electrode active material portion (116a) of the distance Wb ₁ is a 50 ~ 90μm is preferred. As a result, the lithium ion secondary battery 101 of the present embodiment more satisfactorily satisfies the above relational expression (1), and corresponds to the width of each of the convex negative active material portion 112a and the convex positive active material portion 116a. It is easy to secure these heights, and a high aspect ratio can be realized more reliably.

Moreover, in the lithium ion secondary battery 101 of this embodiment, it is preferable that height Ha of the convex negative electrode active material part 112a, and height Hb of the convex positive electrode active material part 116a are 50-100 micrometers, respectively. Thereby, resistance of the convex negative electrode active material part 112a and the convex positive electrode active material part 116a does not rise too much, and the fall of charge / discharge capacity can be prevented.

Here, as the negative electrode current collector 110, a known material can be used in the technical field to which the present invention belongs, as in the first embodiment, but any metal film such as aluminum foil may be used. In addition, although not shown, this negative electrode current collector 110 may be formed on the surface of an insulating base material. What is necessary is just to use the flat member formed from an insulating material as such a base material, and resin, glass, ceramics, etc. are mentioned as such an insulating material, for example. In addition, the substrate may be a flexible substrate having flexibility.

6 to 8, the negative electrode active material layer 112 includes a plurality of linear convex negative active material portions 112a formed at intervals to extend along the Y direction on the negative electrode current collector 110. Consists of.

As the negative electrode active material included in the convex negative electrode active material portion 112a, those commercially available in the technical field of the present invention can be used similarly to the first embodiment. For example, metals, metal fibers, carbon materials, oxides, Nitrides, silicon, silicon compounds, tin, tin compounds, various alloy materials and the like. Among these, in consideration of the size of the capacity density and the like, oxides, carbon materials, silicon, silicon compounds, tin, tin compounds and the like are preferable. As the oxide, for example, the formula: may be mentioned lithium titanate, such as represented by Li ₄ Ti ₅ O _12. As a carbon material, various natural graphite (graphite), coke, graphitized conductive carbon, carbon fiber, spherical carbon, various artificial graphite, amorphous carbon, etc. are mentioned, for example. As a silicon compound, a silicon containing alloy, a silicon containing inorganic compound, a silicon containing organic compound, a solid solution, etc. are mentioned, for example. As a specific example of a silicon compound, for example, silicon oxide represented by SiO _a (0.05 <a <1.95), silicon and Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Sn and Ti Some of the alloys, silicon, silicon oxides or silicon contained in the alloys comprising at least one element selected from B, Mg, Ni, Ti, Mo, Co, Ca, Cr, Cu, Fe, Mn, Nb, And silicon compounds or silicon-containing alloys substituted with at least one element selected from Ta, V, W, Zn, C, N and Sn, and solid solutions thereof. As the tin compound includes, for example, a _{SnO b (0 <b <2} ), SnO 2, SnSiO 3, Ni 2 Sn 4, Mg 2 Sn and the like. A negative electrode active material may be used individually by 1 type, and may be used in combination of 2 or more type as needed.

In addition, the convex negative electrode active material portion 112a may contain a conductive aid similarly to the first embodiment. As the conductive aid, those commercially available in the technical field of the present invention can be used. For example, graphite such as natural graphite and artificial graphite, acetylene black, ketjen black, channel black, furnace black, lamp black, thermal black, etc. Conductive fibers such as carbon blacks, carbon fibers and metal fibers, metal powders such as carbon fluoride and aluminum, conductive whiskers such as zinc oxide, conductive metal oxides such as titanium oxide, organic conductive materials such as phenylene derivatives, and the like. Can be mentioned. A conductive agent can be used individually by 1 type, or can be used in combination of 2 or more type as needed.

As described above, the lithium ion secondary battery 101 of the present embodiment opposes the negative electrode A constituted by the negative electrode current collector 110 and the negative electrode active material layer 112, and the positive electrode active material layer 116 and the positive electrode current collector. The anode C constituted by 118 is laminated, and has a structure including an electrolyte layer 114 and a separator 120 between the cathode A and the anode C. FIG. Therefore, in the lithium ion secondary battery 101 of this embodiment, it has the space which has airtightness between the negative electrode A and the positive electrode C, and the electrolyte solution is filled in this space and the electrolyte layer 114 is formed.

As the separator 120, the porous film, the nonwoven fabric, etc. which showed the outstanding high rate discharge performance similar to the said 1st Embodiment can be used individually or in combination. As a material which comprises the separator 120, For example, polyolefin resins, such as polyethylene and a polypropylene, polyester resins, such as polyethylene terephthalate and a polybutylene terephthalate, polyvinylidene fluoride, vinylidene fluoride-hexafluoro Propylene copolymer, vinylidene fluoride-perfluorovinylether copolymer, vinylidene fluoride-tetrafluoroethylene copolymer, vinylidene fluoride-trifluoroethylene copolymer, vinylidene fluoride-fluoroethylene copolymer, vinylidene fluoride-hexafluoro Acetone copolymer, vinylidene fluoride-ethylene copolymer, vinylidene fluoride-propylene copolymer, vinylidene fluoride-trifluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene copolymer, vinylidene fluoride-ethylene- Tetrafluoroethylene copolymer etc. are mentioned.

In the separator 120, for example, a polymer gel composed of a polymer such as acrylonitrile, ethylene oxide, propylene oxide, methyl methacrylate, vinyl acetate, vinylpyrrolidone, polyvinylidene fluoride, and an electrolyte. You can also use

As the electrolyte solution constituting the electrolyte layer 114, a conventionally known electrolyte solution containing a lithium salt and an organic solvent can be used, similarly to the first embodiment. Examples of lithium salts include lithium hexafluorophosphate (LiPF ₆ ), lithium perchlorate (LiClO ₄ ), lithium bistrifluoromethanesulfonylimide (LiTFSI), and the like. Moreover, ethylene carbonate, diethylene carbonate, ethyl methyl carbonate, etc. are mentioned as an organic solvent, for example, A mixture thereof can also be used.

On the positive electrode current collector 118, the same as the negative electrode active material layer 112 made of the convex negative electrode active material 112a on the negative electrode current collector 110, the convex positive electrode active material portion 116a containing the positive electrode active material The positive electrode active material layer 116 is provided.

As the positive electrode current collector 118, a known material can be used in the technical field to which the present invention belongs, as in the first embodiment, but a metal film such as copper foil may be used. In addition, similar to the negative electrode current collector 110, the positive electrode current collector 118 may be formed on the surface of an insulating base material. What is necessary is just to use the flat member formed from an insulating material as such a base material, and resin, glass, ceramics, etc. are mentioned as such an insulating material, for example. In addition, the substrate may be a flexible substrate having flexibility.

As a positive electrode active material (powder) which the convex positive electrode active material part 116a contains, like a said 1st Embodiment, a lithium containing composite metal oxide, a chalcogen compound, manganese dioxide, etc. are mentioned, for example. The lithium-containing composite metal oxide is a metal oxide containing lithium and a transition metal or a metal oxide in which a part of the transition metal in the metal oxide is substituted by a dissimilar element. Here, as the different element, for example, Na, Mg, Sc, Y, Mn, Fe, Co, Ni, Cu, Zn, Al, Cr, Pb, Sb, B and the like can be cited, and Mn, Al, Co , Ni, Mg and the like are preferred. The number of the different elements may be one or two or more. Among these, lithium containing composite metal oxide can be used preferably. Examples of the lithium-containing composite metal oxide include Li _x CoO ₂ , Li _x NiO ₂ , Li _x MnO ₂ , Li _x Co _y Ni _{1 - y} O ₂ , Li _x Co _y M _1-y O _z , Li _{x Ni 1 - y M y O z} , Li x Mn 2 O 4, Li x Mn 2 - y M y O 4, LiMPO 4, Li 2 MPO 4 F ( g. of each of the formulas, for example, M is Na, Mg At least one selected from the group consisting of Sc, Y, Mn, Fe, Co, Ni, Cu, Zn, Al, Cr, Pb, Sb, V, and B. 0 <x≤1.2, 0 <y≤0.9, 2.0≤z≤2.3), LiMeO ₂ (wherein, Me = MxMyMz; Me and M, and the like transition metals, x + y + z = 1 ). Specific examples of the lithium-containing composite metal oxide, examples thereof include, for example, there may be mentioned _{LiNi 1/3 Mn 1/3} Co 1/3 O 2, LiNi 0.8 Co 0.15 Al 0.05 O 2 and the like. Here, x value which shows the molar ratio of lithium in each said formula increases or decreases by charging / discharging. Moreover, as a chalcogen compound, titanium bisulfide, molybdenum bisulfide, etc. are mentioned, for example. A positive electrode active material can be used individually by 1 type, and may use 2 or more types together. The positive electrode active material layer 16 may contain the conductive aid described above with respect to the negative electrode active material layer 12.

As described above, the negative electrode current collector 110, the negative electrode active material layer 112, the electrolyte layer 114, the separator 120, the electrolyte layer 114, the positive electrode active material layer 116, and the positive electrode current collector 118 are used. The lithium ion secondary battery 101 of this embodiment is formed.

In addition, although not shown, the lithium ion battery secondary battery 101 may be provided with a tab electrode as appropriate, and the plurality of lithium ion battery secondary batteries 101 may be connected in series and / or in parallel. A lithium ion secondary battery device can also be comprised.

The lithium ion secondary battery 101 of this embodiment which has such a structure can also be comprised thin and bendable. In addition, since the negative electrode active material layer 112 and the positive electrode active material layer 116 have a three-dimensional structure having irregularities as shown in the figure, and the surface area with respect to the volume is increased, the negative electrode active material layer 112 and the positive electrode active material layer 116 ), The contact area between each of the electrolyte solution 114 and the electrolyte solution 114 can be largely secured, and high efficiency and high output can be obtained. In this manner, the lithium ion secondary battery 1 of the present embodiment is compact and high performance.

Next, a method of manufacturing the electrode and the lithium ion secondary battery 101 in the above-described embodiment will be described. When manufacturing the lithium ion secondary battery 101 of this embodiment, first, the negative electrode active material layer 112 which consists of the convex-shaped negative electrode active material part 112a is formed in the negative electrode collector 110, and the negative electrode A is produced, The positive electrode C is formed by forming the positive electrode active material layer 16 made of the convex positive electrode active material portion 116a on the positive electrode current collector 118.

As shown in FIG. 6, the negative electrode A and the positive electrode C are arranged such that the convex negative electrode material portion 112a faces the adjacent convex positive electrode material portion 116a in the positive electrode active material layer 116. In addition, lamination is performed through the separator 120. An airtight sealed space is formed between the negative electrode A and the positive electrode C, and the electrolyte solution is filled therein to form the electrolyte layer 114, and the separator 120 is also impregnated with the electrolyte solution.

The convex negative electrode active material portion 112a may, for example, (a) move the nozzle for discharging the negative electrode active material material including the negative electrode active material in a linear manner with respect to the negative electrode current collector 110, and thus, on the negative electrode current collector 110. A coating step (ie, a coating step using a nozzle dispensing method) for forming a plurality of convex negative electrode active material portions 112a made of a negative electrode active material material on the substrate, and (b) drying to dry the convex negative electrode active material portions 112a. It can form by a process.

In the coating step of (a), as shown in FIG. 8A, the nozzle 140 is moved relative to the negative electrode current collector 110 by conveying the negative electrode current collector 110 in the direction of an arrow Y ₁ . Move it. On the surface of the negative electrode current collector 110 to be conveyed, a paste-shaped negative electrode active material material is discharged from the nozzle 140 so as to form the convex negative electrode active material portion 112a. In this embodiment, the position of the nozzle 140 is fixed, and the nozzle 140 is moved relative to the negative electrode current collector 110 by conveying the negative electrode current collector 110.

The paste-shaped negative electrode active material is composed of a mixture obtained by stirring and mixing (mixing) the negative electrode active material, the conductive aid, the binder, the solvent, and the like by a conventional method, and can be discharged from the nozzle 140. What is necessary is just to have a various viscosity in the range. In this embodiment, it is preferable that it is a lower limit of 10 Pa.s and an upper limit of about 10000 Pa.s at the shear rate 1s- ¹ , for example. In addition, each component may be melt | dissolved in the solvent, and may be disperse | distributed (it includes the case where one part melts and the remainder is disperse | distributed.).

Moreover, although the solid content ratio of the negative electrode active material used for the said application process can have various solid content ratios so that a negative electrode active material material can discharge from the nozzle 140, the solid content ratio is smaller than the solid content ratio in the wet point of the said mixture. It is preferable that it is, for example, 60 mass% of © '.

Such viscosity and solid content ratio also vary depending on the type, compounding amount, size, or shape of components such as a negative electrode active material, a conductive aid, a binder, and a solvent, but the negative electrode active material, the conductive aid, a binder, a solvent, and the like. It can adjust according to the length of the kneading | mixing time at the time of stirring and mixing (mixing) by a conventional method.

As the binder, those commercially available in the technical field of the present invention can be used. For example, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyethylene, polypropylene, aramid resin, polyamide, polyimide , Polyamideimide, polyacrylonitrile, polyacrylic acid, polyacrylic acid methyl ester, polyacrylic acid ethyl ester, polyacrylic acid hexyl ester, polymethacrylic acid, polymethacrylic acid methyl ester, polymethacrylic acid ethyl ester, polymethacrylic acid Hexyl ester, polyvinyl acetate, polyvinylpyrrolidone, polyether, polyethersulfone, polyhexafluoropropylene, styrene-butadiene rubber, ethylene-propylene diene copolymer, carboxymethyl cellulose and the like. Moreover, the air of the monomer compound selected from tetrafluoroethylene, hexafluoropropylene, perfluoroalkyl vinyl ether, vinylidene fluoride, chlorotrifluoroethylene, ethylene, propylene, pentafluoropropylene, fluoromethyl vinyl ether, acrylic acid, hexadiene, etc. Coalescing may be used as a binder. A binder can be used individually by 1 type, or can be used in combination of 2 or more type as needed.

As a solvent, it is preferable to use the organic solvent except water so that lithium hexafluorophosphate (LiPF ₆ ) contained in the electrolyte layer 114 may not be decomposed. As such an organic solvent, those commonly used in the technical field of the present invention can be used. For example, dimethylformamide, dimethylacetamide, methylformamide, N-methyl-2-pyrrolidone (NMP), dimethylamine , Acetone, cyclohexanone and the like. An organic solvent can be used individually by 1 type, or can mix and use 2 or more types.

Here, FIG. 8A is a side view schematically illustrating the formation of the convex negative electrode active material portion 112a constituting the negative electrode active material layer 112 by the nozzle dispensing method (that is, the negative electrode current collector to be conveyed). FIG. 8B is a view of the convex negative electrode active material portion 112a constituting the negative electrode active material layer 112 by the nozzle dispensing method. ) Is a perspective view schematically showing a state in which is formed.

In this nozzle dispensing method, a nozzle 140 having a plurality of discharge ports for discharging a negative electrode active material as a coating liquid is disposed above the negative electrode current collector 110, and while discharging a certain amount of the negative electrode active material from the discharge port, The current collector 110 is transported at a constant speed in the direction of the arrow Y ₁ relative to the nozzle 140. In this way, on the negative electrode current collector 110, a plurality of linear convex active material portions 112a made of a negative electrode active material material are formed along the Y direction, and are applied so as to form a pattern of stripe-shaped line and space.

When a plurality of discharge ports are provided in the nozzle 140, a plurality of linear convex negative electrode active material portions 112a can be formed to have a stripe shape, and the conveyance of the negative electrode current collector 110 is continued, whereby the negative electrode current collector 110 is carried out. The linear convex negative active material portion 112a may be formed in a stripe shape on the entire surface of the substrate.

Since the plurality of linear convex active material portions 112a formed of the negative electrode active material material formed as described above are still in a coating film state including a solvent or the like, the negative electrode current collector 110 provided with the convex active material portions 112a is provided. Is conveyed so that it may pass through lower areas, such as a blower which is a drying means, for example, and a drying process is performed by dry air. Thereby, the negative electrode A which consists of the negative electrode collector 110 and the negative electrode active material layer 112 which consists of the linear convex active material part 112a formed in the surface of the negative electrode collector 110 can be obtained.

The drying temperature and drying time of a drying process can be suitably selected by those skilled in the art. The drying temperature should just be a range which can dry the convex active material part 112a, and can fix the shape, For example, in the range of 5 to 150 degreeC, Preferably it is the range of normal temperature (23 degreeC)-80 degreeC What is necessary is just temperature inside. Moreover, drying time can also be controlled according to the conveyance speed of the negative electrode collector 110.

Next, the formation of the cathode active material layer 116 on the cathode current collector 118 can also be performed in the same manner as the formation of the anode active material layer 112 on the anode current collector 110. The negative electrode A and the positive electrode C obtained as described above are laminated in a state where the negative electrode active material layer 112 and the positive electrode active material layer 116 are opposed to each other through a separator 120 in a space having airtightness, and the separator 120 and the The electrolyte is filled in the space to form the electrolyte layer 114. In this manner, the lithium ion secondary battery 101 of the present embodiment is prepared.

`` Deformation mode ''

As mentioned above, although 2nd Embodiment of this invention was described, this invention is not limited only to these. For example, in the said 2nd Embodiment, although the case where the convex negative electrode active material part 112a and the convex positive electrode active material part 116a were linear was demonstrated, the convex negative electrode active material part and the convex positive electrode active material part are examples. For example, the shape may be substantially square.

Here, FIG. 9, a modified embodiment of the lithium ion secondary cell 101 of the embodiment, FIG. 7 and, like Figure 6 substantially convex shape of square pillar shape of the part seen in projection from a direction of an arrow Z ₁ in the The schematic diagram which shows the positional relationship of the upper end of the negative electrode active material part 122a and the upper end of the substantially square pillar-shaped convex positive electrode active material part 126a is shown.

In this modification, as shown in FIG. 9, similarly to the above embodiment, the convex anode material portions 122a are laminated to face each other between adjacent convex anode material portions 126a, and the convex anode active materials are stacked. portion (122a) adjacent to the two sides a distance Wb ₁ and Wb ₂ of L ₁ and a width of L ₂ (length) Wa ₁ and (space) between the top of the Wa _2, and a convex-shaped positive electrode active material portion (126a), which in Fig. As shown in 9

Relationship (1): Wa ₁ &gt; Wb ₁ and

Relationship (2): Wa ₂ > Wb ₂

Are satisfied.

More specifically, in the present modified embodiment, the substantially square pillar-shaped convex negative active material portion 122a is adjacent to each other when viewed in the same manner as projected from the direction of arrow Z ₁ in FIG. 6. It has a substantially rectangular shape with orthogonal two sides L ₁ and L ₂ (see FIG. 9). Similarly, the substantially rectangular convex positive electrode active material portion 126a also has a substantially rectangular shape having two sides that are orthogonal to each other when viewed in the same manner as projected from the direction of arrow Z ₁ in FIG. 6. It has a shape.

The upper edge M ₁ of the convex positive electrode active material part 126a is positioned to face the side L ₁ of the convex negative electrode active material part 122a, and the width of the side L ₁ of the convex negative electrode active material part 122a is located. The distance Wb ₁ between Wa ₁ and M ₁ between the upper ends of the convex positive electrode active material portion 126a (space) satisfies the relation (1): Wa ₁ > Wb ₁ .

In addition, the sides of the convex-shaped negative electrode active material portion (122a) side at a position opposite to the L _2, convex-shaped positive electrode active material part (126a) (space) M ₂ is located, the convex-shaped negative electrode active material portion (122a) between the top of the L and the width Wa of the _{second 2,} between the top of the convex shape positive electrode active material part (126a) (space) is the distance Wb of ₂ M _2, expression (2), and thus, satisfies the _second Wa> Wb _2.

Such a substantially rectangular pillar-shaped convex negative electrode active material portion 122a and an approximately square pillar-shaped convex positive electrode active material portion 126a are also formed by controlling the discharge amount and timing of the nozzle by the nozzle dispensing method as in the above-described embodiment. can do.

Since the lithium ion secondary battery 101 of this modification aspect has the above structures, even when the convex negative electrode active material portion 122a and the convex positive electrode active material portion 126a have a high aspect ratio, they are convex. The negative electrode active material portion 122a does not enter the concave portion between the adjacent convex positive electrode active material portions 126a, so that the convex negative electrode active material portion 122a and the convex positive electrode active material portion 126a are separated by the separator 120. It is possible to effectively prevent damage by puncture or breakage, and a separator type lithium ion secondary battery 101 having a large capacity and excellent fast charging and discharging characteristics can be formed.

In addition to these embodiments and modified embodiments, the lithium ion secondary battery of the present invention may adopt various forms within the scope of the technical idea of the present invention.

For example, in the said embodiment and modified aspect, the structure which the size of a convex negative electrode active material part is larger than the space between convex positive electrode active material parts, and a convex negative electrode active material part does not enter between convex positive electrode active material parts is demonstrated. However, the lithium ion secondary battery of the present invention, on the contrary, has a configuration in which the size of the convex positive electrode active material portion is larger than the space between the convex negative electrode active material portions, and the convex positive electrode active material portion does not enter between the convex negative electrode active material portions. You may have it.

Moreover, in the said embodiment and the modified aspect, although the case where both the convex negative electrode active material part and the convex positive electrode active material part was linear or substantially prismatic shape was demonstrated, one side of the lithium ion secondary battery of this invention was linear. And the other side may have the structure which is substantially square pillar shape.

Moreover, in the said embodiment and the modified aspect, although the case where both the convex-shaped negative electrode active material part and the convex-shaped positive electrode active material part were formed in a fixed space on the negative electrode collector and the positive electrode collector, respectively was demonstrated, it was convex. In the base part (namely, the part which contact | connects a negative electrode electrical power collector and a positive electrode electrical power collector) of a shape negative electrode active material part and a convex positive electrode active material part, adjacent convex negative electrode active material parts or convex positive electrode active material parts may be continuous.

Moreover, in the said embodiment and the modified aspect, since application | coating by the nozzle dispensing method is applied to formation of the convex negative electrode active material part and the convex positive electrode active material part which need to have an uneven structure, various patterns can be formed in a short time. . It is also possible to suitably apply the nozzle dispensing method to the formation of fine patterns.

The present invention is not limited to the above embodiment, and various changes can be made in addition to those described above without departing from the spirit thereof. For example, the coating method applied in each process is not limited to the above, As long as it meets the objective of the said process, you may apply another coating method. For example, the electrolyte solution layer in the above embodiments and modified embodiments may be a gel electrolyte layer if a separator is used. In that case, you may apply | coat an electrolyte material by a spin coat method or a spray coat method.

1 lithium ion secondary battery 10 negative electrode current collector
12 Anode active material layer 12a, 22a, 32a linear anode active material portion
14 Electrolyte Layer 16 Cathode Active Material Layer
16a, 26a, 36a linear positive electrode active material portion 18 positive electrode current collector
20 cathode 40 nozzle
101 Lithium Ion Secondary Battery 110 Negative Current Collector
112 anode active material layers 112a and 122a convex anode active material portions
114 Electrolyte Layer 116 Cathode Active Material Layer
116a, 126a convex positive electrode active material portion 118 positive electrode current collector
120 cathode 140 nozzle

Claims (13)

A first electrode having a first current collector and a first active material layer formed of a plurality of convex first active material portions provided on the first current collector;
A second electrode having a second current collector and a second active material layer formed of a plurality of convex second active material portions provided on the second current collector;
A separator positioned between the first electrode and the second electrode,
The first electrode and the second electrode are laminated so as to face the convex first active material part between adjacent convex second active material parts,
The convex first active material portion has a configuration in which the convex second active material portion does not enter between the lithium ion secondary battery. A first electrode having a first current collector and a plurality of substantially convex linear first active material portions provided on a surface of the first current collector;
A second electrode having a second current collector and a plurality of substantially convex linear second active material portions provided on the surface of the second current collector;
A separator positioned between the first electrode and the second electrode,
The first electrode and the second electrode are stacked such that the linear first active material portion and the linear second active material portion face each other.
When viewed from a direction substantially perpendicular to the surfaces of the first current collector and the second current collector, the first electrode and the first electrode are disposed in a positional relationship where the linear first active material portion and the linear second active material portion intersect. A lithium ion secondary battery, wherein two electrodes are stacked. The method according to claim 2,
When viewed from a direction substantially perpendicular to the surfaces of the first current collector and the second current collector, the first electrode and the plurality of linear second active material portions intersect with each other in a positional relationship. The second electrode is overlapped, characterized in that the lithium ion secondary battery. The method according to claim 2,
When viewed from a direction substantially perpendicular to the surfaces of the first current collector and the second current collector, the first electrode and the linear active material portion are substantially perpendicular to each other in a positional relationship in which they are orthogonal to each other. The second electrode is overlapped, characterized in that the lithium ion secondary battery. A first electrode forming step of forming a plurality of convex linear first active material portions substantially parallel to each other on a surface of a first current collector to obtain a first electrode,
A second electrode formation step of obtaining a second electrode by forming a plurality of convex linear second active material portions substantially parallel to each other on the surface of the second current collector;
A laminate formation step of obtaining a laminate by laminating the first electrode and the second electrode via a separator so that the first active material portion and the second active material portion face each other;
In the laminate formation step, when viewed from a direction substantially perpendicular to the surfaces of the first current collector and the second current collector, the positional relationship where the linear first active material portion intersects with the linear second active material portion The method of manufacturing a lithium ion secondary battery, wherein the first electrode and the second electrode are laminated as possible. The method according to claim 5,
In the laminate forming step, when the linear first active material portion intersects the plurality of linear second active material portions when viewed in a direction substantially perpendicular to the surfaces of the first current collector and the second current collector. The method of manufacturing a lithium ion secondary battery, wherein the first electrode and the second electrode are laminated so as to be in a relationship. The method according to claim 5,
In the laminate formation step, the positional relationship where the linear first active material portion and the linear second active material portion are substantially orthogonal when viewed in a direction substantially perpendicular to the surfaces of the first current collector and the second current collector. The method of manufacturing a lithium ion secondary battery, wherein the first electrode and the second electrode are laminated so as to be. A first electrode having a first current collector and a first active material layer formed of a plurality of convex first active material portions provided on the first current collector;
A second electrode having a second current collector and a second active material layer formed of a plurality of convex second active material portions provided on the second current collector;
A separator positioned between the first electrode and the second electrode,
The first electrode and the second electrode are laminated so as to face the convex first active material part between adjacent convex second active material parts,
The convex first active material part is larger in size than the space between the convex second active material parts, and the convex first active material part has a configuration that does not enter between the convex second active material parts. Secondary battery. The method according to claim 8,
The widths Wa ₁ and Wa _{2 of} two adjacent sides of the upper end of the convex first active material part, and the distances Wb ₁ and Wb ₂ between the upper ends of the convex second active material parts opposite to the two sides,
Relationship (1): Wa ₁ &gt; Wb ₁ and
Relationship (2): Wa ₂ > Wb ₂
Lithium ion secondary battery, characterized in that to satisfy. The method according to claim 8,
The convex first active material portion and the convex second active material portion are each linear. The method according to claim 8,
The convex first active material portion and the convex second active material portion are each substantially rectangular in shape. The method according to claim 8,
And the convex-shaped first active material width Wa Wa ₁ and ₂ parts of a 100 ~ 150μm, wherein the convex-shaped second active material, the distance between the top portion Wb ₁ and Wb ₂ is a lithium ion secondary battery, characterized in that 50 ~ 90μm. The method according to claim 8,
The height Ha of the said convex 1st active material part, and the height Hb of the said convex 2nd active material part are 50-100 micrometers, respectively, The lithium ion secondary battery characterized by the above-mentioned.

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